Exercises for the voice include lip rolls by creating the "brrr" sound through the lips and sustaining it for a minute. The takeaway here is that you often do stuff during a performance that you aren't even aware of, so the goal should be to improve your kinesthetic awareness in order to infuse power and persuasiveness into your performance, and avoid confusing and distracting body language. When you tune the skin back to when you started, the sound won't be the same anymore.